Method of making swivel couplings



' Mgr-a1 6, 1940.

J. R. SKOVE'RSKI METHOD OF MAKING SWIVEL COUPLINGS Filed Feb. 14, 19:58

HA5 ATTORN-EY W 5 W/ mu m n rm- VA 7% I 5 1 m 4 I I6 Patented Mar. 26. .1940 v invention relates to swivel Couplings; andthe broadzobject'of the invention is toprovide' a method of making'a coupling of small size I g; zqlelzt J METHOD t. MAKING sWwEL-ooUP N John R. Skoverski, Oakland, C 'alifs ffas signor"to I Joseph SohonSan Francisco, Calif.

pplication February 14. 19ss,-sera1ih.190.4291- x I 2 Claims.' (0 1. sa e) f capable ofi'carryinglarge loads. 1

Another object of the invention is to provide,-

such a coupling which also presents a good appearance and. which is easy to make.

The invention possesses other objects and fea- .tures{ of advantage, some of which, with the embodiments thereof 16' foregoing, .will be set forth in the following de- Figure l, the flange 1 of the socket member is scription of my invention. It is to'lbe understood that Ido notlimit myself to thisdisclosure of species of my invention, as I mayadopt variant within the scope of the claims. I 1

Referring to the drawing:

partly in elevation, showing the stud and socket members before the socket is compressed about fishing tackle. 1 I

In terms of broad inclusion, the coupling embodying my invention comprises stud and socket members connected together to provide a swivel joint. The socket member is originally formed with a recess having a large enough opening'to.

I permitinsertion of the enlarged end'of' the stud.

After the stud is seated in the recess, the end of the socket member is compressed to close the recess openings sufficiently to hold the studwithin the socket.

In greater detail, and referring to the draw-. .ing, the swivel coupling embodying my invention comprises a stud 'member 2 having a reduced neck "portion 3 terminating in an enlarged head 4; The latter isrelatively fiat, giving it the shape of a buttonrather than abalL This flattened at the end opposite head 4.-

Socket member 6 has a flanged portion '1 pro-- viding a recess '8 made wide enough to permit,

an outwardly projecting ring ll extending from the outeredge of seat 9 to the end of the flange.

This socket member also has an eye l2 at the "Figure l is a side view, partly in section and compressed'inwardly aboutthe elongated neck 3 of the stud, thus closing the recess opening suffi- 'ciently to hold the stud head 4 within the socket.

' In this closing operation themetal is deformed and the ring. ll u' hichv originally projected outwardly is reduced tothe diameter of the socket body. The deformation in the metal forms an inwardly projecting tubular ring I3 extending axially of neck 3 and interposed between head 4 and. the body of stud member 2. This is clearly shown in Figure 2. It will beperceived that. the ring H which was originally formed on the outside of the socket flange has been transposed into I a retaining ring l3 on the inside of the flange.

JWhen flange Tis compressed the seat 9 closes somewhat, .and the *seat is therefore originally bored oversize (see Figure 1) so that when the flange is compressed to its'closed position the "walls of seat 9 fit snugly about head 4 yet with sufiicientclearance to permit free rotation of the stud. Thisfclosing of the seat about the head of the stud without binding is made'possible by the flattenedshape-of the head. If the head were atrue sphere it would bedifficult to effect the closing without binding against the ball and impairing its free swivel action. f

The compression of flange! to close the socket is preferably accomplished byfforcing the as- I sembled coupling through a die "or a size equal. to the final diameter of the coupling. When ring the diameter of the coupling. As the ring is pressed in a V -shaped groove I4 is formed about the periphery of the socket member. This groove -H passes through the die it is thus reducedto is not objectionable .hcwever and rather adds to the appearance of the coupling. In order to balance this groove the edge of stud member 2 is preferably beveled, to form a second groove [5. g The improved swivel coupling made by the method of 'my invention is not only attractive. and compactin appearancaibut has great me- I chanical strength. Under abreak-down'jtest the coupling failed at another point before, the swivel f .joint pulled apart. Thus with acoupling having an overall diameter of about inch, one oi'j the eyes tore out under a pull of over 1200 pounds without dislodging the swivel joint. Such strength in a swivel coupling of small size is highly desirable for 'many purposes, such as in 1 the stays of aeroplanes. The coupling in larger sizes finds'many uses in general rigging, and in smaller sizes is useful for such purposes as fishing tackle. a

Figure 3 shows the coupling adapted for use in fishing tackle and having a triangular ring H5 in one of the eyes connected with a strip I1 of rawhide; the latter having an end It folded back and fastened in any suitable manner to,- provide a loop. The other end of the straphas asimilar ring so that the unit may be interposed between the line and leader. Rawhide strap I] when wet is capable of considerable stretching under tension, and therefore provides a flexible link adapted to take up the shock 0i? sudden jerks on the line. 1

I claim; v v 1. The methodlof making a swivel coupling, which comprises forming a socket into which a stud with a head and neck may be inserted; form responding to the shape of the socket as formed solely by said compression.

2. The method of making a swivel coupling,

which comprises forming a socket into which a stud with a head and neck may be inserted, form'- anexternal ring on the socket to surround theneck portion of the stud when inserted into the socket, undercutting the inner portions of the socket priorito insertion of the'stud, and then compressing the socket While cold to transpose the external ring into an internal retaining ring surrounding the neck portion of the stud for holding said head within the socket, the shape,

of said head and neck corresponding to the shape 'of the socket as formed solely by said compression.

JOHN R. SKOVERSKI, 

